.div1 {
  width: 100px;
  height: 200px;
  background-color: blue;
}

.div2 {
  width: 100px;
  height: 200px;
  background-color: yellow;
  display: flex;
}

.div2 .div3 {
  width: 75px;
  height: 200px;
  background-color: red;
  display: flex;
  display: flex;
  justify-content: center;
  align-items: center;
}

.div2 .div4 {
  width: 50px;
  height: 100px;
  background-color: green;
}

.font1 {
  color: blue;
}

.font2 {
  color: red;
}
